<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
        "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <title>500</title>
    <style>
        *{
            margin: 0px;
            padding: 0px;
        }
        #message {
            width: 400px;
            height: 400px;
            position: fixed;
            line-height: 400px;
            text-align: center;
            top: 0px;
            left: 0px;
            right: 0px;
            bottom: 0px;
            margin: auto;
            font-family: '微软雅黑', 'Lato', Calibri, Arial, sans-serif;
            font-size: 200px;
            color: #0e83cd;
        }
    </style>
</head>
<body>
<div id="message">
    500
</div>
</body>
</html>